1 st Hi- Lumi WP 6 kick-off meeting 17 November 2011

1st Hi-Lumi WP 6 kick-off meeting

17 November 2011

Cold Powering and Superconducting Links

A. Ballarino, CERN

Hi-Lumi Collaborative ProjectFP7-InfrastructuresTwenty participantsProposal submitted in 2011

WP6Cold Powering and Superconducting Links for LHC High Luminosity Upgrade

WP6 Participants: CERN, INFN, University of Southampton

A. Ballarino, 17 Nov. 2011

Work Package 6

Task 1Coordination

Task 2Cryogenics

Task 3Electr. Transf.

Cryostat

Task 4Energy Dep.

Material

Accelerator Physics and Performance

Collimators

WP 6

Fluka team

Magnet Design

Crab cavities

Goal of Hi-Lumi upgrade:

Reduce * by stronger and larger aperture quadrupole magnets located near thecollision points (low- triplet quadrupoles). Increase of Bp that can be transformed inhigher quadrupole gradient or/and larger bore diameter

Nb3Sn optionIop = 15 200 ABp = 11.9 TGradient = 171 T/m



SCHEMATIC LAYOUT OF THE low- TRIPLET

Distances in m

MQXA


IP1

Q3,Q2,Q1DFBXD1Q4,D2Q5Q6

DFBL

DFBAQ11, Q10…Q7

IP 8

TASTAN

4.5 K 4.5 K 1.9 K

12 m 3 m

3.6 m

UJ 13RR 13

Layout at Point 1


POWERING CONFIGURATION OF THE LHC –TODAY- INNER TRIPLETS

Nested circuits One trim power converter on Q1

D1 at P1 and P5: resistive magnetQ1, Q2 and Q3: four leads, each rated at 7500 A DC Corrector magnets: quadrupole, sextupole octupole (120 A/600 A)

DFBXA and DFBXB at P1DFBXE and DFBXF at P5

N. of leads Rating (A)

10 120

14 600

4 7500

Itot 40 kA


POWERING CONFIGURATION OF THE HIGH LUMINOSITY –NEW- INNER TRIPLETS

D1 at P1 and P5: resistive magnetQ1, Q2 and Q3: four leads, each rated at 7500 A

Corrector magnets: 120 A (dipole) and 600 A (sextupole)

resistive magnet superconducting magnet, I 10 kA four leads, each rated at 7500 A eight to four leads, each rated up to 15 kA

Individual powering of each circuit ?

Nested powering, e.g. one main power converter plus current trimming on each magnet ?

Split powering, e.g. Q1 in series with Q2a and Q3 in series with Q2b ?

Need for energy extraction via warm resistors of each individual magnet, i.e. need for safety leads and additional superconducting cables in the cold bus ?

Time constant of the circuits and amount of stabilizer in the cables ?

Itot 40 kA 40 kA > 100 kA


IP1

Q3,Q2,Q1DFBXD1Q4,D2Q5Q6

DFBL

DFBAQ11, Q10…Q7

IP 8

TASTAN

4.5 K 4.5 K 1.9 K

12 m 3 m

3.6 m

UJ 13RR 13

Layout at Point 1


I I

Room temperature

Cryogenic environment(4.5 K LHe in the DFBs)

Tunnel

Cold powering system:

1) Current leads in a distribution cryostat (near the power converters);2) Vertical electrical transfer (link);3)Horizontal electrical transfer (link);4) Cryogenic fluid supply and control;5) Interconnection to the magnets bus system;6) Protection of link and current leads.

PM 15

PM 54DFBXF (UJ56)DFBXE (RZ54)

DFBXA (UJ13)

DFBXB (UJ16)


2100 kA



MgB2 Tape : 3.640.65 mm2

MgB2: 12 %Cu : 15 %

MgB2

YBCO

YBCO Tape : 4 0.1 mm2

YBCO: 1-3 mCu : 220 m

Bi-2223Bi-2223 Tape : 4 0.1 mm2

YBCO: 1-3 mCu : 220 m


Conductors in Superconducting Links

0

20

40

60

80

100

120

Nb-Ti Nb3Sn MgB2 Y-123 Bi-2223

Criti

cal T

empe

ratu

re

Conductor

Ic(77 K, self field) 100 A

YBCO

MgB2


Conductors in Superconducting Links


Nb-Ti cablesused in LHC 6 kA at 6 K

MgB2 cable6 kA at 20 K(> 12 kA at 4.5 K)

6 mm

Minimum quench energy of superconductors

Nb-Ti, Top = 5 KTc= 6 K → MQE = 2.63 mJ/cm3

Tc = 7 K → MQE = 5.26 mJ/cm3

Tc = critical temperatureTop = operating temperatureMQE= Minimum Quench Energy

20 K-50 K


Cryogenics for Cold Powering System

Tunnel

Where else in the LHC ?

P1

P7

P5P5


P7 Underground Installation

Current Leads andPower Converters

~ 250 m

~ 250 m

Option also for P3

48 cables rated at 600 A per linkTwo links each about 500 m long


http://kosmicki.home.cern.ch/kosmicki/new-photos/point7/us76/us76.htm


S.Weisz, J. Osborne

What do we have today ?

= 40

25 × 2 × 600 A (2 × 15 kA) @ 35 K MgB2

@ 65 K (YBCO and Bi-2223)

~2 kg/m

~ 200 mHTS/mcable


CERN Prototype Link

Link for Point 7


Integration of CERN Prototype Link in cryostat @ SOTON

L=5 m


MgB2

Bi-2223

YBCO

600 A

Test of 600 A HTS Cables

Measurements @ Southampton University (gas cooling) and CERN (liquid heliumand liquid nitrogen). Length of HTS cables 2 m

Proceedings of EUCAS 2011

MgB2

YBCOBi-2223

MgB2

Bi-2223

YBCO

600 ATop

15 K55 K


Test of CERN 600 A HTS Cables

(CERN measurements)

(SOTON measurements)

Proceedings of EUCAS 2011


R=1.5 m

Cryostat for Link (20 m length) in SM-18

Semi-flexible linein SM-18 test station


Cryostat for Link (20 m length) in SM-18

= 75

= 15.5

3 × 6 kA

27 cables 6000 A48 cables 600 AItot = 190 kA @ 20 K (2 × 95 kA)

~10 kg/m

~ 900 mHTS/mcable

=70

24 × 6000 A42 × 600 AItot = 169 kA & 20 K ( 2 × 84.5 kA)

A. Ballarino, Proceedings of ASC 2010


MgB2 round wire

YBCO tape

High-current cable configurations

Φ = 62 mm

7 × 14 kA, 7 × 3 kA and 8 × 0.6 kA cables – Itot120 kA @ 30 K


MgB2 round wire

High-current cable configurations

Development of round wire at Columbus Superconductors

CHALLENGES


Significant/unprecedented vertical transfer ( 100 m)Need for reinforcement of cables (10 kg/m 1000 kg)Need for appropriate compensation of thermal contraction in the straightvertical part

Complex system to be integrated in the LHC machine

Significant/unprecedented high-current long HTS cables (up to 15 kA)

Complex multi-cable assembly

Task 1Coordination

Task 2Cryogenics

Task 3Electr. Transf.

Cryostat

Task 4Energy Dep.

Material

Hi-Lumi FP7 WP6Design study

CERN activityDesign study

Integration

Civil engineering

Interfaces(mech, vacuum, electr)

Vacuum

SC cables/SC link

Cryostat of SC link

Current leads

Protection

CERN activity

- Prototypes construction- Prototypes test

- System design- Series specification- Series construction- Integration- Operation

OVERVIEW OF GLOBAL ACTIVITY

Fluka team

2012 20202018

HTS Links in LHCP1, P5,P7

HTS Links in LHC Hi-LumiP1 and P5

Timeline

2012-2013 2018-2019 2020-2021

Test ofhorizontallinks

2014

Test ofverticallinks

Civil Engineering

Superconductor

System production


Documents

1 st Hi- Lumi WP 6 kick-off meeting 17 November 2011